Trolley-car-pole attachment.



G. R. DUNN.

TROLLEY CAR POLE ATTACHMENT. APPLICATION FILED 001213, 1909.

971,494, Patented Sept. 27, 1910.

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GEORGE E. DUNN, OF SAN PEDRO, CALIFORNIA;

TROLLEY-CAR-E'OLE ATTACHMENT.

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, Specification of. Letters Patent. Patented Sept. 2"(, 191%}.

Application filed October 13, 1909. Serial No. 522,379.

To all whom it may concern:

Be it known that I, GaoaonR. DUNN, a citizen of the United States, and aresident of San Pedro, in the county of Los Angeles and State ofCalifornia, have invented certain new and useful Improvements inTrolley-Car-Pole Attachments, of which the following is a specification.

My invention is an improvement upon the one for which I have receivedLetters Patent of the United States, No. 882,495, dated March 17, 1908.

My present improvement is a safety attachment for the frame of theapparatus, by which the movement'of the frame relative to the forked barcarrying the trolley-wheel is limited, so that the wheel will maintainits proper position relative to the wire even if the spring chainconnected with the harp should break or become detached.

The invention is illustrated in the accompanying drawing, in which-Figure 1 is a side elevation of the same; Fig. 2 is a longitudinalsection thereof; and Fig. 3 is a horizontal section on the line 33 ofFig. 1.

In my present invention as in the former one, I employ a slotted frame Ain whose heada forked bar B, carrying the trolley wheel C, is pivoted sothat the frameniay assume an angle shown in Fig. 2. The shank b of saidbar B extends below the pivot and is provided with a hook with which aspring chain D is engaged, the lower end of said chain being detachablyconnected at a with the shank of the frame A. The wheel is thus adaptedto to said bar and wheel, as-

keep its vertical position when following the conducting wire in passingaround curves, etc., the bar B bein allowed to swing laterally andassume an o tuse angle to the frame A, as shown by dotted lines in Fig.2. The spring chain allows this lateral move ment. and in my formerinvention there was no limit to such movement save the tension of thechain. In my present invention, however, I employ a safety attachmentcomprising a ring E through which the shank b of the wheel-carrying barB passes and in which'it is free to move laterally so far as permittedby the diameter of the ring. The atter is provided with lateral slots ornotches that receive the inner edges of the members of the forkedframe Aand it is secured in position adjacent to the lower end of the shank bof the bar B. It will be seen that the ring Eserves as a guard or safetyattachment which will permit due lateral swing of the bar B so that allcurves can'be turned safely even if the chain D should be broken orbecome detached.

What I claim is:-

' The improved trolley-pole attachment comprising; a slotted frameprovided with a fixed, transverse ring a short distance below its head.a trolley wheel bar pivoted in said head and provided with a shankextending, through the said ring, and a spring chain connecting theshank with the lower portion of the frame, as shown and described.

. GEORGE R. DUNN. YVitnesses:

Josnrn P. SYLVA, Jn, FRANCES L. BROSZMER.

